Lateral behavior of concrete under uniaxial compressive cyclic loading

Osorio, Edison; Bairán, Jesús M.; Bernat, Antonio Ricardo Marí

doi:10.1617/s11527-012-9928-9

Cited by 53 publications

(36 citation statements)

References 26 publications

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“…So, it is necessary to know the transverse reinforcement strain that occurs as a result of the transverse concrete expansion. This strain is related with the longitudinal strain through the dilatancy parameter (Khajeh and Attard [22], Lokuge et al [23], Montoya et al [24], Osorio et al [25]).…”

Section: Transverse Reinforcement Stiffnessmentioning

confidence: 99%

Mixed model for the analytical determination of critical buckling load of passive reinforcement in compressed RC and FRC elements under monotonic loading

Pereiro‐Barceló

Bonet

2017

Engineering Structures

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Compressed reinforcements on reinforced concrete (RC) and steel fibre reinforced concrete (SFRC) columns are generally submitted to cyclic and monotonic loading, which can buckle. This phenomenon can cause the reduction of both ductility and peak loads, which is why design standards propose constructive details to avoid this. Although the bibliography mentions that steel fibres in concrete can delay buckling of reinforcements, design codes do not distinguish between concrete types (with and without fibres) in these constructive details. Analytical models that determine the length and critical buckling stress of reinforcements may consider this effect. Nowadays, analytical models can be classified as discrete and distributed depending on whether they consider transverse reinforcement stiffness and the stiffness of the concrete cover that concentrates on transverse reinforcements, or if they are distributed along the element, respectively. Both discrete and distributed models are valid for small transverse reinforcement separations, while distributed models that only consider the concrete cover effect are valid for large transverse reinforcement separations. This paper proposes a mixed model to determine critical buckling loads of compressed reinforcements subjected to monotonic loading to use the stress-strain relationships of reinforcing bars, including buckling, that are found in the scientific-technical literature. This model considers transverse reinforcements discretely and concrete cover distributedly. The model can be applied to any transverse reinforcement configuration, and to any concrete type (with or without fibres). An analytical equation is also proposed to determine critical compressed reinforcement loads, whose result is presented as abaci. Finally, to calibrate the model in normal-strength concrete columns under eccentric loading, with or without fibres, a programme is presented in which the critical load of longitudinal reinforcements is experimentally determined. The proposed analytical model is calibrated and a procedure to determine critical buckling loads of compressed reinforcements under monotonic loading is proposed.

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Section: Transverse Reinforcement Stiffnessmentioning

confidence: 99%

Mixed model for the analytical determination of critical buckling load of passive reinforcement in compressed RC and FRC elements under monotonic loading

Pereiro‐Barceló

Bonet

2017

Engineering Structures

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“…However, the strength bias seems uniform with the concrete strength while it increases in the case of confined strength. A reason for this may be found in the different dilatancy characteristics of high strength concrete with respect to normal concrete, as recently demonstrated in Osorio et al [11]. Further research in this respect is required.…”

Section: (4)mentioning

confidence: 90%

Seismic Behavior of Medium and High Strength Concrete Buildings

Bairán¹,

Moreno-González²,

Peguero³

2015

TOCIEJ

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Current concrete technology has made higher concrete grades more affordable to mid and high-rise buildings; hence its use has been increasing in the late years as it allows for smaller cross-sections, reduction of the structure’s weight, improve durability, among other benefits. However, it is known that brittleness of plain concrete increases with the strength; therefore, some national codes have limited the concrete’s strength in high seismic zones. In this paper, the seismic behavior of a 10 storey dual frame-wall building, designed with concrete grades C30, C60 and C90 is studied in order to assess the advantages and disadvantages of this material and investigate the effects of high concrete strength on the seismic behavior of buildings. In total, three models were studied. Furthermore, a comparison between Force-Based-Design (FBD) and Displacement-Based-Design (DBD) methodologies is made. DBD showed advantages in determining the adequate design ductility and the distribution of forces between frame and wall. The structures are designed according to Eurocode 8 for seismic design high ductility structures. To assess the seismic performance of the building, pushover analyses were made according to the Eurocode 8 (N2 method) in order to determine the performance point. It is observed that adequate design could accommodate concrete’s reduction of ductility. Needed confinement levels can objectively be defined for different concrete strength. Some benefits of the overall increase of strength are highlighted in the paper. The C90 building showed adequate response, although changes on the failure mode were observed.

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“…Therefore, Priestley and Park did not find a section depth correlation [29]. Given the analysis presented above and Figure 11, the following expression can be derived using equations (16), (17) and (19):…”

Section: Effect Of Shear Force On Plastic Hinge Lengthmentioning

confidence: 97%

“…The dilation ratio depends on the concrete type and the magnitude of the confinement stresses. Experimental measurements on concrete strength classes between C35 and C60 under uniaxial compression have been used to develop the following expression for the dilation angle at the post-peak branch in terms of the unconfined and confined strength of the concrete [9,19]:…”

Section: Figure 4 Effects Of Bidirectional Shear Forces On Concretementioning

confidence: 99%

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Analytical modeling of reinforced concrete columns subjected to bidirectional shear

Osorio

Bairán

Bernat

2017

Engineering Structures

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Under general seismic loading, reinforced concrete columns may be subjected to lateral loads in more than one direction. Available experimental data on columns subjected to bidirectional forces indicate that higher levels of damage and a higher loss of ductility and strength have been observed compared to similar tests under unidirectional shear forces. In this study, an experimental program was conducted in which six lightly reinforced concrete columns were subjected to unidirectional and bidirectional cyclic shear forces. This observation was used to identify the mechanisms and parameters governing the behavior of columns subjected to cyclic bidirectional lateral loads. Hence, a new conceptual model was developed to obtain the capacity of member. The shear forces were analyzed and an analytical formulation was derived to account for the effects in the concrete stress-strain relationship, the moment-curvature diagram and the plastic hinge length. These equations were used along with a structural model with concentrated plastic hinges to obtain the capacity curve of the column. The results of the formulations developed were verified using the results of the experiments performed on columns subjected to unidirectional and bidirectional cyclic lateral forces.Peer ReviewedPostprint (author's final draft

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Lateral behavior of concrete under uniaxial compressive cyclic loading

Cited by 53 publications

References 26 publications

Mixed model for the analytical determination of critical buckling load of passive reinforcement in compressed RC and FRC elements under monotonic loading

Mixed model for the analytical determination of critical buckling load of passive reinforcement in compressed RC and FRC elements under monotonic loading

Seismic Behavior of Medium and High Strength Concrete Buildings

Analytical modeling of reinforced concrete columns subjected to bidirectional shear

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